下列现象中，属地球自转产生的是：[ ]
A．四季更替
B．经度每隔15 度，地方时相差1 小时
C．昼夜现象
D．正午太阳高度角变化
答案：B
A．I′=3I
B．I′＜3I
C．P′=3P
D．P′＜3P
Obama’s father was among the first to settle in ________ is known as the most fantastic tourist attraction--Hawaii.
A．where
B．what
C．which
D．that
